Free Windows Vista and MS Office - Price, Your Soul
Well, not quite your soul, just knowledge of everything you do with the software. You can get started on the Windows feedback page. They have two types of feedback systems - a survey feedback or an embedded tracking solution that the program FAQ says is not spyware.
Although you might not believe it, MS takes great care in its customer research and analysis processes and they follow through with freebies. I was involved in one research study in preparation for Windows 2000 and MS Office 2000, and for very little effort received about $1,000 worth of product.
